摘要
由于现有的抵抗打印-扫描攻击的鲁棒数字水印算法缺乏抵抗二次打印-扫描的能力.本文利用子块的离散余弦变换域直流系数与所有子块直流系数的均值之间的大小关系稳定性,提出一种抗二次打印-扫描鲁棒零水印算法.通过对图像进行分块离散余弦变换,计算所有子块直流系数的均值;通过比较各个子块的直流系数与所有子块直流系数的均值之间的大小关系产生零水印.算法分别对抵抗一次打印-扫描攻击的鲁棒性、抵抗一次打印-扫描和常规信号处理混合攻击的鲁棒性、抵抗二次打印-扫描攻击的鲁棒性、抵抗二次打印-扫描和常规信号处理混合攻击的鲁棒性进行了测试.实验结果表明,该算法在测试中表现出很强的鲁棒性.
Because the existing robust watermarking algorithms cannot involve the research of robustness against dual print-and-scan process,a robust zero-watermarking algorithm against dual print-and-scan process was proposed.The algorithm was based on the stability of the numerical relationship between each block′s direct coefficient and the average of direct coefficients form all blocks in discrete cosine transformation domain.The image was divided into non-overlapping blocks,and each block was transformed with discrete cosine transformation.Zero-watermark sequence was produced by judging the numerical relationship between each block′s direct coefficient and the average of direct coefficients form all blocks.Some tests were carried out including its robustness against single print-and-scan process,conventional signal processing after single print-and-scan process,dual print-and-scan process,and conventional signal processing after dual print-and-scan process.The results show that the proposed algorithm has excellent robustness towards those above attacks.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2011年第1期142-148,共7页
Acta Photonica Sinica
基金
浙江省教育厅(No.Y201017916)项目资助
关键词
离散余弦变换
二次打印-扫描
鲁棒性
零水印
Discrete Cosine Transformation（DCT）
Dual print-and-scan process
Robustness
Zero-watermarking
